#include "test_mem.h"

#include "lwip/mem.h"
#include "lwip/stats.h"

#if !LWIP_STATS || !MEM_STATS
#error "This tests needs MEM-statistics enabled"
#endif
#if LWIP_DNS
#error "This test needs DNS turned off (as it mallocs on init)"
#endif

/* Setups/teardown functions */

static void
mem_setup(void)
{
}

static void
mem_teardown(void)
{
}


/* Test functions */

/** Call mem_malloc, mem_free and mem_trim and check stats */
START_TEST(test_mem_one)
{
#define SIZE1   16
#define SIZE1_2 12
#define SIZE2   16
    void *p1, *p2;
    mem_size_t s1, s2;
    LWIP_UNUSED_ARG(_i);

    fail_unless(lwip_stats.mem.used == 0);

    p1 = mem_malloc(SIZE1);
    fail_unless(p1 != NULL);
    fail_unless(lwip_stats.mem.used >= SIZE1);
    s1 = lwip_stats.mem.used;

    p2 = mem_malloc(SIZE2);
    fail_unless(p2 != NULL);
    fail_unless(lwip_stats.mem.used >= SIZE2 + s1);
    s2 = lwip_stats.mem.used;

    mem_trim(p1, SIZE1_2);

    mem_free(p2);
    fail_unless(lwip_stats.mem.used <= s2 - SIZE2);

    mem_free(p1);
    fail_unless(lwip_stats.mem.used == 0);
}
END_TEST

static void malloc_keep_x(int x, int num, int size, int freestep)
{
    int i;
    void *p[16];
    LWIP_ASSERT("invalid size", size >= 0 && size < (mem_size_t) -1);
    memset(p, 0, sizeof(p));
    for(i = 0; i < num && i < 16; i++)
    {
        p[i] = mem_malloc((mem_size_t)size);
        fail_unless(p[i] != NULL);
    }
    for(i = 0; i < num && i < 16; i += freestep)
    {
        if (i == x)
        {
            continue;
        }
        mem_free(p[i]);
        p[i] = NULL;
    }
    for(i = 0; i < num && i < 16; i++)
    {
        if (i == x)
        {
            continue;
        }
        if (p[i] != NULL)
        {
            mem_free(p[i]);
            p[i] = NULL;
        }
    }
    fail_unless(p[x] != NULL);
    mem_free(p[x]);
}

START_TEST(test_mem_random)
{
    const int num = 16;
    int x;
    int size;
    int freestep;
    LWIP_UNUSED_ARG(_i);

    fail_unless(lwip_stats.mem.used == 0);

    for (x = 0; x < num; x++)
    {
        for (size = 1; size < 32; size++)
        {
            for (freestep = 1; freestep <= 3; freestep++)
            {
                fail_unless(lwip_stats.mem.used == 0);
                malloc_keep_x(x, num, size, freestep);
                fail_unless(lwip_stats.mem.used == 0);
            }
        }
    }
}
END_TEST

/** Create the suite including all tests for this module */
Suite *
mem_suite(void)
{
    testfunc tests[] =
    {
        TESTFUNC(test_mem_one),
        TESTFUNC(test_mem_random)
    };
    return create_suite("MEM", tests, sizeof(tests) / sizeof(testfunc), mem_setup, mem_teardown);
}
